Biblion

scoped` context processor handles case when `request.resolver_match` is None

Increased max_length of Post.slug field from 50 to 90 chars, matching Post.title field length.
Invoke self.full_clean() from Post.save() for model validation.
Update documentation to include pinax-images dependency.
Add Django v1.10 to testing matrix.
Remove Django "master" (latest dev branch) from testing matrix.

- updated pytz version ([PR 92](https://github.com/pinax/pinax-blog/pull/92))
- updated docs ([PR 87](https://github.com/pinax/pinax-blog/pull/87), [PR 89](https://github.com/pinax/pinax-blog/pull/89))

- Fixed feed_url creation in blog_feed view ([PR 82](https://github.com/pinax/pinax-blog/pull/82))
- Updated docs to use url namespace ([PR 87](https://github.com/pinax/pinax-blog/pull/87))